Which of the following lycophytes is not properly matched to its description?
A. lycopodium: grow low to the ground, have
branching stems and leaves that grow in a
helical pattern
B. selaginella: leaves are held in a single
plane giving their branched stems a
distinctive appearance; many grow as
epiphytes
C. quillworts (isoetes): small plants that live
along the margins of lakes and streams
D. tree-sized lycophytes: possess a vascular
cambium; these can still be found today in
tropical forests in Africa
D
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As oomycetes infected and killed potato plants during the Irish Potato Famine, oomycetes can be classified as a(n) _________________. Select all correct choices
A. virulent pathogen B. biotrophic pathogen C. avirulent pathogen D. necrotrophic pathogen
Most of the water vapor in the earth's
atmosphere comes from evaporation from a. lakes. b. rivers. c. land. d. oceans. e. plants.
Apple maggot flies appear to be two separate races. What makes these races different?
A) They look different. B) They eat different foods. C) They have different allele frequencies. D) They mate at different times.
Most biological molecules are joined by
A) hydrogen bonds. B) peptide bonds. C) covalent bonds. D) ionic bonds. E) disulfide bonds.